ZOOLOGY AND BOTANY, MICROSCOPY, ETC. 583 



Marine Algae from North Carolina.* — M. A. Howe and W. D. 

 Hoyt describe the novelties found in a collection of marine algas from 

 Beaufort, North Carolina, dredged from a submerged reef which forms 

 the northern limit of certain tropical and subtropical algae. Seven 

 species are new, and two had previously been recorded only from Europe. 

 The novelties are : Microchsete nana, Derlesia turbinata, Phaeostroma 

 pusilluni, Erythrodadia recondita, E. vagahunda, Acrochsetiiim infestans, 

 A. affine. The two new extra-European records are : Streblonema 

 soUtarium (Sauv.) De Toni, and Elachistea stelhdata,Gviff. Figures are 

 given of the new species. 



Gametophyte of Laminaria.t — C Sauvageau describes in detail 

 the gametophytes of Laminaria JfexkauUs and L. saccharina. Last 

 year he announced his discovery of a sexual and asexual alternation of 

 generations in SaccorMza, which in its main lines resembled Eqnisetum. 

 He now describes a similar occurrence in the two species of Laminaria, 

 though the process of development differs in certain details. The 

 antheridia and oogonia are described fully, and figured. The female 

 prothallus is the " protonema " of Williams and of Kilian. 



Fungi. 

 (By A. LoBEAiN Smith, F.L.S.) 



Development of Protomyces. J — G. von Biiren finds that the 

 resting-spore of Protomyces is multinucleate, the nuclei being extremely 

 small ; they seem to contain a nucleolus and a nuclear vacuole ; 

 chromatin could not be detected. 



On germination the endosporium pushed out as a globose swelling 

 or as a cylindrical tube, and the plasma and nuclei pass over into the 

 sporangium so formed ; gradually the plasma and nuclei move towards 

 the wall, and then become divided into four separate portions which are 

 uninucleate, and later form the uninucleate spores. No nuclear fusion 

 was observed. In the chlamydospores paired nuclei were found, but 

 the pairs might possibly be the result of division rather than of paii'ing. 



Conjugate Nuclei in the Ascomycetes.§— E. J. Welsford diaws 

 attention to the constant appearance of conjugate nuclei in the 

 mycelium of Botrytis, and she explains the phenomenon as due to rapid 

 nuclear divisions, the resultant daughter-nuclei remaining for some time 

 in pairs. Similar observations were made on the iniclei in well- 

 nourished hyphffi of Sderotinia Liher liana. From this she ai'gues that 

 conjugate nuclei in ascogenous hyphte are not necessarily indicati\ e of 

 sexual origin. 



* Memoirs New York Bot. Garden, vi. (1916) pp. 105-23 (5 pis.). 

 t C.R. Acad. Sci. Paris, clxii. (1916) pp. 601-4 (figs.). 

 X Verb. Schweiz. Nat. Ges., 1914, pp. 193-5. 

 § Ann. Bot., xxx. (1916) pp. 415-7 (4 figs.). 



